Abstract
Three novel pentacyclic triterpenoid dienolides, phyllenolide A (=3β-acetoxyglutina-5(10), 6-dien-27,8α-olide; 1), phyllenolide B (=3β-(benzoyloxy)glutina-5(10),6-dien-27,8α-olide; 2), and phyllenolide C (=3β-(2-hydroxybenzoyloxy)glutina-5(10),6-dien-27,8α-olide; 3), were isolated from the aerial parts of Phyllanthus myrtifolius Moon. (Euphorbiaceae). These three compounds possess an endocyclic γ-lactone moiety across ring C and a homo-annular diene system in ring B. Their structures were established by analyses of CD, NOED, and 2D-NMR spectra.
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